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Forensic psychology practice PsychCheck will conduct the assessments, made up of psychometric tests and a structured one-on-one interview.

The process will begin this month and the department expects about 350 staff will have completed assessments by April.

In November, the state government committed $432 million to create a new child protection system, outlining a broad vision to help families and support children from the womb to adulthood.

It accepted 196 recommendations in full and another 60 in principle from the 260 handed down by former Supreme Court Justice Margaret Nyland, who headed the royal commission.

The state opposition has welcomed the new psychological testing process.

But opposition spokeswoman Rachel Sanderson said the government still needs to be more transparent, including by releasing a 2014 review into child protection staff conducted by former police commissioner Mal Hyde.

"Sweeping uncomfortable facts under the table is no way to deal with the problems they point to," she said in a statement on Wednesday.